Evolution of nano-pores during annealing of technically pure molybdenum sheet produced from different sintered formats

被引：1

作者：

Jakob, S. ^{[1
,2
]}

Lorich, A. ^{[3
]}

Knabl, W. ^{[3
]}

Stark, A. ^{[4
]}

Clemens, H. ^{[1
]}

Spoerk-Erdely, P. ^{[1
]}

Maier-Kiener, V. ^{[1
]}

机构：

[1] Univ Leoben, Dept Mat Sci, Franz Josef Str 18, A-8700 Leoben, Austria

[2] Chalmers Univ Technol, Dept Phys, S-41296 Gothenburg, Sweden

[3] Plansee SE, Metallwerk Plansee Str 71, A-6600 Reutte, Austria

[4] Helmholtz Zentrum Hereon, Inst Mat Phys, Max Planck Str 1, D-21502 Geesthacht, Germany

来源：

INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS | 2023年 / 110卷

关键词：

Molybdenum; Porosity; Recrystallization; SAXS; Synchrotron; Volatilization; GRAIN-BOUNDARY SEGREGATION; RECRYSTALLIZATION BEHAVIOR; GAS-BUBBLES; ATOM-PROBE; MECHANISM; POROSITY; KINETICS;

D O I：

10.1016/j.ijrmhm.2022.106032

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Molybdenum is a refractory metal with no phase transformation in the solid state and a high melting point. It is therefore an excellent structural material for various high temperature applications. Especially in this field of operation, significant creep resistance is essential. To achieve this, a microstructure with grains in the range of millimeters is desired. However, as demonstrated in the present study, the onset temperature for secondary recrystallization, which would lead to a beneficial grain size, is among other things dependent on the initial dimensions of the sintered part. One possible reason for the different microstructural evolutions is the influence of residual pores in sub-micrometer size. Sheets were thus fabricated via three different production routes employing the same initial Mo powder to exclude chemical variation as an influencing factor. The samples were investigated by in-situ small-angle X-ray scattering at a synchrotron radiation source with two different heating rates. Additionally, selected annealed samples were studied ex-situ with high energy X-rays. The apparent vol-ume fraction of pores is compared to a volatilization model for the vaporization of typical accompanying ele-ments and the induced thermal expansion.

引用

页数：10